Rule/Formula Present Perfect Tense
(+) S + has/have + been + O/C
S + has/have + V3 + O/C
(-) S + has/have + not + been + O/C
S + has/have + not + V3 + O/C
(?) Have/has + S + been + O/C
Have/has + S + V3 + O/C
Find here Example of Present Perfect Tense:
(+) He has been at home for a month.
Roni has eaten the steak already.
(-) He has not been at home for a month.
Roni has not eaten the steak already.
(?) Has he been at home for a month?
Has he eaten the steak already?
Yes, he has. / No, he has not.